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Erik Kabik/ RETNA

What happens in Vegas, stays in Vegas ends up on Instagram.

But in Anna Kendrick's case, it's not a big deal because there's nothing incriminating and everything awesome about her ladies' trip to Sin City this weekend. The actress reunited with her Pitch Perfect costars Brittany Snow and Kelley Jackle, along with some more gal-pals, to watch Britney Spears' show at Planet Hollywood.

"Sometimes these things just can't be avoided. #YaBettahWorkBitch#VegasBaby#BlueLightDistrict," Kendrick wrote with a photo of the girls' silhouettes as they struck a pose in front of a wall full of blue lights. "Trying our best. #britneysbackupdancers?," Jackle captioned the same photo.

While in Las Vegas, the girls also enjoyed a trip to Hakkasan Las Vegas Nightclub at MGM Grand Hotel & Casino on Saturday night, where they hung out at a VIP table on the main stage next to the DJ booth. Arriving just before midnight, Kendrick and Snow enjoyed themselves while sipping champagne and cocktails and showing off their best dance moves with friends to the high-energy set by deejay duo Dada Life.

In fact, Hakkasan was filled with celebs that night, including Divergent's Theo James, Chase Crawford and Miles Teller, who was celebrating his 27th birthday with friends. Around 1 a.m., Teller was presented with a three-tier cake as confetti flew through the air and his name took over the floor-to-ceiling LED screen. The cake, decorated with a Fantastic Four theme, in honor of his newly announced role as Mr. Fantastic in the upcoming reboot.

Kendrick shared another photo from their vacation, writing, "Fresh faced and innocent. Little did we know.... #Vegas#TheseF--kinGuys."

Maybe a Britney-inspired cover will be featured in the sequel? We can only hope!

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